Ris Low had come under public pressure to be stripped of her 2009 title, after local media reported she stole seven credit cards last year while working at a medical clinic, buying goods worth about S$8,000 ($5,662) including gold anklets and phones.
Organizers of the pageant ERM World Marketing said she had resigned Tuesday of her own accord. She will no longer represent Singapore at the Miss World finals to be held in South Africa in December, but her replacement has not yet been decided.
Low had also been criticized for her poor English, mispronouncing "bikini" in a recent video, leading others in multicultural Singapore to spring to her defense and soul -searching on websites about the national character.
"If there was a beauty contest for countries, how do you think Singapore would fare on the world stage? We seem to have the aesthetic qualifications. But with a very ugly personality," said blogger Solofigure09 on the Straits Times newspaper's website.